CVE-2025-69700Public exploitNetwork attack vector

Unauthenticated router crash via unchecked CGI parameter concatenation

Published Feb 23, 2026 · Updated Feb 23, 2026

Stack-based buffer overflow in Tenda FH1203 2.0.1.6 allows remote attackers to crash or reboot the router through the SetClientPrio CGI endpoint. formSetClientPrio passes unvalidated ip and mac parameters to modify_add_client_prio, where sprintf concatenates them into a 516-byte stack buffer without bounds checking. An unauthenticated crafted HTTP request with a nonzero op value and an oversized parameter is sufficient; service interruption is confirmed, while code execution is unconfirmed.

CVSS severity7.5
High
EPSS probability3.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in Tenda FH1203 2.0.1.6 allows remote attackers to crash or reboot the router through the SetClientPrio CGI endpoint. formSetClientPrio passes unvalidated ip and mac parameters to modify_add_client_prio, where sprintf concatenates them into a 516-byte stack buffer without bounds checking. An unauthenticated crafted HTTP request with a nonzero op value and an oversized parameter is sufficient; service interruption is confirmed, while code execution is unconfirmed.

The record

CVE
CVE-2025-69700
Published
Feb 23, 2026
Updated
Feb 23, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-121, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 23, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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